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Build a Simple VCL Application for Hive Data

How to build a simple VCL Application to view Hive data in RAD Studio using the CData FireDAC Components for Hive.

Embarcadero RAD Studio provides a development environment for Delphi and C++Builder applications. With the CData FireDAC Components for Hive, you gain access to live Hive data within RAD Studio, abstracting the data into tables, views, and stored procedures that can be used to both retrieve and update Hive data. This article will walk through connecting to Hive and creating a simple VCL application with the Form Designer.

Creating a VCL Application for Hive Data

The following instructions show how to use the Form Designer to create a simple VCL Forms application that shows the basic FireDAC objects needed to connect to Hive from any application.

The following example populates a TDBGrid control.

  1. Create a new VCL Forms Application.
  2. Drop a TFDPhysApacheHiveDriverLink and TFDConnection object onto the form.
  3. Double-click the TFDConnection object. The FireDAC Connection Editor is displayed. Select "CData.ApacheHive" in the DriverId menu and configure the connection properties.

    Apache Hive への接続を確立するには以下を指定します。

    • Server:HiveServer2 をホストするサーバーのホスト名またはIP アドレスに設定。
    • Port:HiveServer2 インスタンスへの接続用のポートに設定。
    • TransportMode:Hive サーバーとの通信に使用するトランスポートモード。有効な入力値は、BINARY およびHTTP です。デフォルトではBINARY が選択されます。
    • AuthScheme:使用される認証スキーム。有効な入力値はPLAIN、LDAP、NOSASL、およびKERBEROS です。デフォルトではPLAIN が選択されます。
    • 本製品においてTLS/SSL を有効化するには、UseSSL をTrue に設定します

  4. Drop a TFDQuery object onto the form and set the properties below:

    • Connection - Set this property to the TFDConnection object, if this object is not already specified.
    • SQL - Click the button in the SQL property and enter a query.
    • Active - Set this property to true.
  5. Drop a TDataSource object onto the form and set the following property:

    • DataSet - In the menu for this property, select the name of the TFDQuery object.
  6. Drop a TDBGrid control onto the form and set the following property:

    • DataSource - Select the name of the TDataSource.
  7. Drop a TFDGUIxWaitCursor onto the form. This is required to avoid a run-time error.

You now have an executable application that displays the results of the SQL Query set in the TFDQuery object.

 
 
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